vocabulary = {}
vocabulary['print()'] = '打印数字、字符串、列表、字典等'
vocabulary['str()'] = '转化为字符串类型'
vocabulary['lower()'] = '将字符串全部以小写进行输出'
vocabulary['upper()'] = '将字符串全部以大写进行输出'
vocabulary['append()'] = '在列表后面添加元素'
print('print:' + vocabulary['print()'])
print('str():' + vocabulary['str()'])
print('lower():' + vocabulary['lower()'])
print('upper():' + vocabulary['upper()'])
print('append():' + vocabulary['append()'])
